vol. 23, No. 4, 2012, p. 581-791

During the first months of the current administration of the Brazilian Chemical Society (BSC), a strategic planning was developed, involving the Board of Directors and the Advisory Board. The Society's mission, vision, principles, external environment (opportunities and threats), internal environment (strong and weak points were all raised and discussed.

A novel fluorescent and selective probe was synthesized and used to follow a cellular process (cell division) in human breast cancer cells (MCF-7) in which the mitochondrial behavior and its distribution could be observed. Details are discussed in the Article Selective and Efficient Mitochondrial Staining with Designed 2,1,3-Benzothiadiazole Derivatives as Live Cell Fluorescence Imaging Probes by Neto et al. on page 770.

Scheme of Candida rugosa lipase immobilization on cellulose supports, like make-up remover pads, using sodium periodate as activating agent. The biocatalyst was used for the removal of the stratified aged linseed oil from canvas surfaces

It is reported the study of a liquid sample from the pyrolysis of wood. The analysis was performed by gas chromatographs with flame ionization detector (GC-FID) and mass spectroscopy (GC-MS). The chromatographic profile corresponds to a sample of a commercial fertilizer. Syringol, 1,2,3-trimethoxybenzene, metoxy-2-4-methylphenol and o-guaiacol were the most abundant substances in the product

Evaluation of the polyphenolic content and antioxidant activity of orange and multifloral honey extracts was carried out by different assays. Orange honey extracts showed higher antioxidant activities and phenolic contents than multifloral honey extracts

Principal component analysis was completed to examine the metal concentrations in total suspended particle (TSP) and PM10 and PM2.5 particulate matter samples, which were collected at an urban location that was strongly influenced by vehicular traffic. Our results reflect the various sources contributing to the composition of particulate matter

The complex modulus (G*) as a function of frequency for SBS (styrene-butadiene-styrene) modified binder (MB) and SBS/organoclays MB (as intercalated nanocomposite) showed higher values of G* when compared to the pure binder at higher temperature-low frequency. Consequently, MBs seems to be more resistant to rutting or permanent deformation

The matrix effect in residue analyses is one of the main problems at the time of the identification and quantification because it affects by far the reproducibility and accuracy of the method. This paper describes the influence of different matrices, clean-up sorbents, extraction solvents and the analyte/matrix ratio on the ionization process at UFLC-MS

Caffeine presents a single oxidation peak at approximately +1.5 V (vs. SCE), due to an oxidation mechanism similar to xanthine, however without formation of uric acid since the nitrogen atoms at positions 3 and 7 are substituted. The oxidation occurs via a 4 electrons process resulting in a substituted uric acid (IV) that is electro-inactive

Esters, as the major and higher impact odor compounds of a typical base wine from Serra Gaúcha in a total ion current chromatogram, obtained through headspace solid phase microextraction and gas chromatography with mass spectrometric detector

A method based on ultrasound-assisted surfactant-enhanced emulsification microextraction (UASEME) was proposed to determine estrogens in water. Significant enrichment factors were found, 85.29 for 17ß-estradiol (ßE2), 173.45 for estrone (E1) and 97.05 for diethylstilbestrol (DES)

A fast and interference free FAAS method for the determination of Ca and Mg in honeys using the solid phase extraction and the two-step elution was developed. It maintained the precision of 1-5% and the accuracy of 1-3%. The limits of detection of 24 ng g-1 of Ca and 4.4 ng g-1 of Mg were obtained

How to cite this articleSantos JSs, Santos MJSs, Santos MLPs. Influence of the Rainfall Regime on the Mobility of Zn, Cd, Ni, Cu, Mn and Fe in the Surface Sediments of the Contas River Located in the Brazilian Semi-Arid Region. J. Braz. Chem. Soc. 2012;23(4):718-726

Zn, Cu, Cd and Ni exhibit higher concentrations in the sediments within the city. The elements Mn and Fe showed higher concentrations in sediments collected outside the urban area and this result may be attributed to contributions from agricultural activities

Emission spectrometry (ICP OES) was used to determine the mineral composition of bee pollen from different Brazilian regions. Brazilian bee pollen may be considered a rich source of Mn and Se and a source of Cu, P and Zn. The elements Ca, Cu, Fe, K, Mg, Mn, Na, P and Zn were important in explaining the classification of pollen according to their geographical origin. The mineral levels varied widely during the year

Selective interactions between proteins and nanomaterials are of interest for the fabrication of biochips with applications spanning from diagnostics to electronics. This study reports the preparation of block copolymer nanodomains featuring phosphonic diacid groups, which were previously shown to reversibly bind to Annexin-A5 proteins

The operating conditions of an inductively coupled plasma optical emission spectrometer were optimized for the determination of REEs using a Doehlert design and the signal-to-background ratio (SBR) of the REEs emission signals and the Mg II/Mg I line intensity ratio were evaluated as response functions

Two high-performance liquid chromatographic (HPLC) methods with ultraviolet detection are described: one for simultaneous determination of total amounts of triacylglycerides, diacylglycerides, monoacylglycerides and fatty acid methyl esters (FAME) in alcoholysis of different oils, and the other one suitable for determining the fatty acid composition of oils analyzing their methyl ester derivatives

Novel designed 2,1,3-benzothiadiazole (BTDs) derivatives were synthesized and tested as selective fluorescent cell markers. The first pi-extension was responsible for the cellular selection (mitochondrial selection) while the second pi-extension resulted in a pronounced "light up" effect. The rationally designed derivative (BTDShiny) was tested to monitor a key cellular process (cell division cycle) using MCF-7 cancer cell lines (human mammal cells), thus allowing future studies of cancer cell death and their processes that are highly associated with mitochondrial stability

The collision/reaction interface (CRI) with He introduced through the skimmer at 100 mL min-1 is employed to improve ICP-QMS accuracy in 31P+ determinations. Cool plasma conditions for the determination of 31P16O+ result in limits of detection 55-fold lower. This strategy is an interesting alternative for high ionization potential elements such as P